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x₁= 5₁ y₁= -2
x - 2y= 4
-2y= -x + 4
y= -1/-2
y= 1/2
Karena tegak lurus, maka :
m₁ . m₂= -1
1/2 . m₂= -1
m₂= -1 : 1/2
m₂= -1 . 2
m₂= -2
y - y₁= m₂(x- x₁)
y - (-2)= -2(x- 5)
y + 2= -2x + 10
y= -2x + 10 - 2
y= -2x + 8
atau
2x + y= 8